Re: AIDC 3733 Stub

And if you are using the DC injector , the attenuator needs to be next to
the receiver before the injector in the IF coaxial line.
Joe K0VTY
=========================
On Sun, 08 Apr 2001 10:24:57 -0400 Douglas Braun NA1DB
<doug@dougbraun.com> writes:
> Remember: If there is going to be any attenuation in the IF path, it
> is
> better to put it just before your receiver than in the
> downconvertor.
> That way it will also attenuate any leak-through of local 2-meter
> signals into the feedline.
>
> Given this, it makes to disable the stub.
>
> Doug
> NA1DB
>
> At 05:52 PM 4/7/01 , BobsImsai8800@aol.com wrote:
> >Joe,
> >
> >The stub is more of a measurement problem than an operational
> problem. When
> >people have measured the gain or the response, they can see the
> hole in the
> >response in some downconverters at 2400 MHZ. Some downconverters
> have the
> >hole somewhere else where it doesn't affect the measurement at
> 2400. They
> >think they that it is broke because the gain doesn't read what it
> says on the
> >cover.
> >
> >As far as NF goes and downconverter performance, the stub has very
> little
> >affect. As long as you have no great losses from an excessively
> long feed
> >line, the gain actually needs to be reduced at the receiver. I use
> the 10 or
> >20 dB pad in my IC R-8500. These downconverters are actually made
> for a
> >fairly long run of RG-59 cable. That is why people are seeing S
> meter
> >readings of S-5 and above in their receiver with just the added
> converter
> >noise.
>
> ----
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>
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